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Remove zl_issuer_lock from zil_suspend(). 

This locking was recently added as part of #14979. But appears it
is illegal to take zl_issuer_lock while holding dp_config_rwlock,
taken by dsl_pool_hold().  It causes deadlock with sync thread in
spa_sync_upgrades().  On a second thought, we should not
need this locking, since zil_commit_impl() we call below takes
zl_issuer_lock, that should sufficiently protect zl_suspend reads,
combined with other logic from #14979.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #15103
This commit is contained in:
Alexander Motin 2023-07-25 12:08:36 -04:00 committed by GitHub
parent 48d0e9465d
commit 2848de11e5
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1 changed files with 0 additions and 4 deletions
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4
module/zfs/zil.c
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@ -3941,13 +3941,11 @@ zil_suspend(const char *osname, void **cookiep)
return (error);
zilog = dmu_objset_zil(os);
mutex_enter(&zilog->zl_issuer_lock);
mutex_enter(&zilog->zl_lock);
zh = zilog->zl_header;
if (zh->zh_flags & ZIL_REPLAY_NEEDED) { /* unplayed log */
mutex_exit(&zilog->zl_lock);
mutex_exit(&zilog->zl_issuer_lock);
dmu_objset_rele(os, suspend_tag);
return (SET_ERROR(EBUSY));
}
@ -3961,7 +3959,6 @@ zil_suspend(const char *osname, void **cookiep)
if (cookiep == NULL && !zilog->zl_suspending &&
(zilog->zl_suspend > 0 || BP_IS_HOLE(&zh->zh_log))) {
mutex_exit(&zilog->zl_lock);
mutex_exit(&zilog->zl_issuer_lock);
dmu_objset_rele(os, suspend_tag);
return (0);
}
@ -3970,7 +3967,6 @@ zil_suspend(const char *osname, void **cookiep)
dsl_pool_rele(dmu_objset_pool(os), suspend_tag);
zilog->zl_suspend++;
mutex_exit(&zilog->zl_issuer_lock);
if (zilog->zl_suspend > 1) {
/*