Commits on Jul 24, 2023

1. ZIL: Fix config lock deadlock. …

   When we have some LWBs closed and their ZIOs ready to be issued, we
   can not afford sleeping on config lock if somebody else try to lock
   it as writer, or it will cause a deadlock.
   
   To solve it, move spa_config_enter() from zil_lwb_write_issue() to
   zil_lwb_write_close() under zl_issuer_lock to enforce lock ordering
   with other threads.  Now if we can't immediately lock config, issue
   all previously closed LWBs so that they could drop their config
   locks after completion, and only then allow sleeping on our lock.
   
   Signed-off-by:  Alexander Motin <mav@FreeBSD.org>
   Sponsored by:   iXsystems, Inc.
   Issue openzfs#15078

   

   amotin committed Jul 24, 2023
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