pgsql: Provide helper for retrying partial vectored I/O.

From: Thomas Munro <tmunro(at)postgresql(dot)org>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Provide helper for retrying partial vectored I/O.
Date: 2023-12-11 22:08:40
Message-ID: E1rCoS8-009kLx-F7@gemulon.postgresql.org
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Provide helper for retrying partial vectored I/O.

compute_remaining_iovec() is a re-usable routine for retrying after
pg_readv() or pg_writev() reports a short transfer. This will gain new
users in a later commit, but can already replace the open-coded
equivalent code in the existing pg_pwritev_with_retry() function.

Reviewed-by: Heikki Linnakangas <hlinnaka(at)iki(dot)fi>
Discussion: https://postgr.es/m/CA+hUKGJkOiOCa+mag4BF+zHo7qo=o9CFheB8=g6uT5TUm2gkvA@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/0c6be59f5e34f44b20d9ec3ffb58c1d9a0bf985e

Modified Files
--------------
src/common/file_utils.c | 77 ++++++++++++++++++++++++++++-------------
src/include/common/file_utils.h | 5 +++
2 files changed, 57 insertions(+), 25 deletions(-)

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