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pgsql: Don't forget about failed fsync() requests.

From:	Thomas Munro <tmunro(at)postgresql(dot)org>
To:	pgsql-committers(at)lists(dot)postgresql(dot)org
Subject:	pgsql: Don't forget about failed fsync() requests.
Date:	2018-11-19 04:46:08
Message-ID:	E1gObRo-00029g-OL@gemulon.postgresql.org
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Don't forget about failed fsync() requests.

If fsync() fails, md.c must keep the request in its bitmap, so that
future attempts will try again.

Back-patch to all supported releases.

Author: Thomas Munro
Reviewed-by: Amit Kapila
Reported-by: Andrew Gierth
Discussion: https://postgr.es/m/87y3i1ia4w.fsf%40news-spur.riddles.org.uk

Branch
------
REL9_4_STABLE

Modified Files
--------------
src/backend/storage/smgr/md.c | 23 ++++++++++++++++++-----
1 file changed, 18 insertions(+), 5 deletions(-)

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