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ZIL: Change ZIOs issue order.

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In zil_lwb_write_issue(), after issuing lwb_root_zio/lwb_write_zio,
we have no right to access lwb->lwb_child_zio. If it was not there,
the first two ZIOs may have already completed and freed the lwb.
ZIOs issue in opposite order from children to parent should keep
the lwb valid till the end, since the lwb can be freed only after
lwb_root_zio completion callback.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #15233
This commit is contained in:
Alexander Motin 2023-09-01 20:14:50 -04:00 committed by Brian Behlendorf
parent 7dc2baaa1f
commit 79ac1b29d5
1 changed files with 2 additions and 2 deletions
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4
module/zfs/zil.c
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@ -1924,10 +1924,10 @@ next_lwb:
BP_GET_LSIZE(&lwb->lwb_blk));
}
lwb->lwb_issued_timestamp = gethrtime();
zio_nowait(lwb->lwb_root_zio);
zio_nowait(lwb->lwb_write_zio);
if (lwb->lwb_child_zio)
zio_nowait(lwb->lwb_child_zio);
zio_nowait(lwb->lwb_write_zio);
zio_nowait(lwb->lwb_root_zio);
/*
* If nlwb was ready when we gave it the block pointer,