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txg visibility code should not execute under tc_open_lock

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The memory allocation and locking in `spa_txg_history_*()` can
potentially block txg_hold_open for arbitrarily long periods of time.

Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #4333
This commit is contained in:
Richard Yao 2016-02-17 16:16:25 -05:00 committed by Brian Behlendorf
parent fcf64f45d9
commit f26b4b3c8a
1 changed files with 5 additions and 4 deletions
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9
module/zfs/txg.c
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@ -365,6 +365,7 @@ static void
txg_quiesce(dsl_pool_t *dp, uint64_t txg)
{
tx_state_t *tx = &dp->dp_tx;
uint64_t tx_open_time;
int g = txg & TXG_MASK;
int c;
@ -376,10 +377,7 @@ txg_quiesce(dsl_pool_t *dp, uint64_t txg)
ASSERT(txg == tx->tx_open_txg);
tx->tx_open_txg++;
tx->tx_open_time = gethrtime();
spa_txg_history_set(dp->dp_spa, txg, TXG_STATE_OPEN, tx->tx_open_time);
spa_txg_history_add(dp->dp_spa, tx->tx_open_txg, tx->tx_open_time);
tx->tx_open_time = tx_open_time = gethrtime();
DTRACE_PROBE2(txg__quiescing, dsl_pool_t *, dp, uint64_t, txg);
DTRACE_PROBE2(txg__opened, dsl_pool_t *, dp, uint64_t, tx->tx_open_txg);
@ -391,6 +389,9 @@ txg_quiesce(dsl_pool_t *dp, uint64_t txg)
for (c = 0; c < max_ncpus; c++)
mutex_exit(&tx->tx_cpu[c].tc_open_lock);
spa_txg_history_set(dp->dp_spa, txg, TXG_STATE_OPEN, tx_open_time);
spa_txg_history_add(dp->dp_spa, txg + 1, tx_open_time);
/*
* Quiesce the transaction group by waiting for everyone to txg_exit().
*/