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making sure the last quiesced txg is synced #8239

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making sure the last quiesced txg is synced #8239

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1e05119
making sure the last quiesced txg is synced
xwcal Jan 5, 2019
80f4270
style fixes
xwcal Jan 5, 2019
e3070bb
style fixes 2
xwcal Jan 5, 2019
4c11367
style fixes 3
xwcal Jan 5, 2019
c82de60
simplified logic
xwcal Jan 8, 2019
025861a
removed garbage
xwcal Jan 8, 2019
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17 changes: 15 additions & 2 deletions module/zfs/txg.c
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Original file line number Diff line number Diff line change
Expand Up @@ -508,6 +508,7 @@ txg_sync_thread(void *arg)
tx_state_t *tx = &dp->dp_tx;
callb_cpr_t cpr;
clock_t start, delta;
boolean_t checked_quiescing = B_FALSE;

(void) spl_fstrans_mark();
txg_thread_enter(tx, &cpr);
Expand Down Expand Up @@ -549,8 +550,20 @@ txg_sync_thread(void *arg)
txg_thread_wait(tx, &cpr, &tx->tx_quiesce_done_cv, 0);
}

if (tx->tx_exiting)
txg_thread_exit(tx, &cpr, &tx->tx_sync_thread);
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if (tx->tx_exiting) {
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if (checked_quiescing) {
txg_thread_exit(tx, &cpr, &tx->tx_sync_thread);
} else {
while (tx->tx_threads != 1)
txg_thread_wait(tx, &cpr,
&tx->tx_exit_cv, 0);
if (tx->tx_quiesced_txg)
checked_quiescing = B_TRUE;
else
txg_thread_exit(tx, &cpr,
&tx->tx_sync_thread);
}
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}

/*
* Consume the quiesced txg which has been handed off to
Expand Down