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txg_wait_synced_flags: add TXG_WAIT_SUSPEND flag to not wait if pool suspended

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This allows a caller to request a wait for txg sync, with an appropriate
error return if the pool is suspended or becomes suspended during the
wait.

To support this, txg_wait_kick() is added to signal the sync condvar,
which wakes up the waiters, causing them to loop and reconsider their
wait conditions again. zio_suspend() now calls this to trigger the break
if the pool suspends while waiting.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Paul Dagnelie <paul.dagnelie@klarasystems.com>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes #17355
This commit is contained in:
Rob Norris 2025-02-24 13:56:08 +11:00 committed by Brian Behlendorf
parent 8487945034
commit 468d22d60c
3 changed files with 31 additions and 1 deletions
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9
include/sys/txg.h
View File

@ -25,6 +25,7 @@
*/
/*
* Copyright (c) 2012, 2017 by Delphix. All rights reserved.
* Copyright (c) 2025, Klara, Inc.
*/
#ifndef _SYS_TXG_H
@ -78,6 +79,9 @@ typedef enum {
/* If a signal arrives while waiting, abort and return EINTR */
TXG_WAIT_SIGNAL = (1 << 0),
/* If the pool suspends while waiting, abort and return ESHUTDOWN. */
TXG_WAIT_SUSPEND = (1 << 1),
} txg_wait_flag_t;
struct dsl_pool;
@ -111,6 +115,11 @@ extern int txg_wait_synced_flags(struct dsl_pool *dp, uint64_t txg,
*/
extern void txg_wait_synced(struct dsl_pool *dp, uint64_t txg);
/*
* Wake all threads waiting in txg_wait_synced_flags() so they can reevaluate.
*/
extern void txg_wait_kick(struct dsl_pool *dp);
/*
* Wait until the given transaction group, or one after it, is
* the open transaction group. Try to make this happen as soon

21
module/zfs/txg.c
View File

@ -23,6 +23,7 @@
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Portions Copyright 2011 Martin Matuska
* Copyright (c) 2012, 2019 by Delphix. All rights reserved.
* Copyright (c) 2025, Klara, Inc.
*/
#include <sys/zfs_context.h>
@ -705,7 +706,7 @@ txg_wait_synced_flags(dsl_pool_t *dp, uint64_t txg, txg_wait_flag_t flags)
int error = 0;
tx_state_t *tx = &dp->dp_tx;
ASSERT0(flags & ~TXG_WAIT_SIGNAL);
ASSERT0(flags & ~(TXG_WAIT_SIGNAL | TXG_WAIT_SUSPEND));
ASSERT(!dsl_pool_config_held(dp));
mutex_enter(&tx->tx_sync_lock);
@ -723,6 +724,15 @@ txg_wait_synced_flags(dsl_pool_t *dp, uint64_t txg, txg_wait_flag_t flags)
* else interesting happens, we'll set an error and break out.
*/
while (tx->tx_synced_txg < txg) {
if ((flags & TXG_WAIT_SUSPEND) && spa_suspended(dp->dp_spa)) {
/*
* Pool suspended and the caller does not want to
* block; inform them immediately.
*/
error = SET_ERROR(ESHUTDOWN);
break;
}
dprintf("broadcasting sync more "
"tx_synced=%llu waiting=%llu dp=%px\n",
(u_longlong_t)tx->tx_synced_txg,
@ -756,6 +766,15 @@ txg_wait_synced(dsl_pool_t *dp, uint64_t txg)
VERIFY0(txg_wait_synced_flags(dp, txg, TXG_WAIT_NONE));
}
void
txg_wait_kick(dsl_pool_t *dp)
{
tx_state_t *tx = &dp->dp_tx;
mutex_enter(&tx->tx_sync_lock);
cv_broadcast(&tx->tx_sync_done_cv);
mutex_exit(&tx->tx_sync_lock);
}
/*
* Wait for the specified open transaction group. Set should_quiesce
* when the current open txg should be quiesced immediately.

2
module/zfs/zio.c
View File

@ -2714,6 +2714,8 @@ zio_suspend(spa_t *spa, zio_t *zio, zio_suspend_reason_t reason)
}
mutex_exit(&spa->spa_suspend_lock);
txg_wait_kick(spa->spa_dsl_pool);
}
int