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ZIL: Change ZIOs issue order. 

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
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Alexander Motin 2023-09-01 20:14:50 -04:00 committed by GitHub
parent b1b99e10a6
commit 9da6b60417
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1 changed files with 2 additions and 2 deletions
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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,