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Thomas Munro 4908c58720 Provide vectored variants of smgrread() and smgrwrite(). ... smgrreadv() and smgrwritev() and their md.c implementations call FileReadV() and FileWriteV(). A range of disk blocks beginning at 'blocknum' and extending for 'nblocks' can be scattered to or gathered from multiple buffers with a single system call. The traditional smgrread() and smgrwrite() functions are implemented in terms of the new functions. Later commits will introduce calls with nblocks > 1, but the following behavioral changes can be seen already: * After a short transfer we'll now retry until we eventually read 0 bytes (= EOF) or get ENOSPC, EDQUOT, EFBIG etc, where previously we would infer the reason. Retrying is consistent with xlog.c's treatment of large WAL writes, and arguably also xlog.c and fd.c's treatment of EINTR. Arbitrary short returns for larger transfers have been observed on several OSes, and might in theory also happen for transient reasons with our own pg_p*v() fallback code. * After unexpected EOF or -1, the error thrown now talks about a range even for the single block case, eg "blocks 42..42". Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi> Discussion: https://postgr.es/m/CA+hUKGJkOiOCa+mag4BF+zHo7qo=o9CFheB8=g6uT5TUm2gkvA@mail.gmail.com		2 years ago
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backend	Provide vectored variants of smgrread() and smgrwrite().	2 years ago
bin	Remove some unnecessary includes of "access/xlog_internal.h"	2 years ago
common	Provide helper for retrying partial vectored I/O.	2 years ago
fe_utils	Remove unneeded assignments in for loop header	2 years ago
include	Provide vectored variants of smgrread() and smgrwrite().	2 years ago
interfaces	Be more wary about OpenSSL not setting errno on error.	2 years ago
makefiles	Remove distprep	2 years ago
pl	Don't specify number of dimensions in cases where we don't know it.	2 years ago
port	Optimize pg_readv/pg_pwritev single vector case.	2 years ago
template	…
test	Fix bugs in manipulation of large objects.	2 years ago
timezone	Remove distprep	2 years ago
tools	Cache opaque handle for GUC option to avoid repeasted lookups.	2 years ago
tutorial	…
.gitignore	…
DEVELOPERS	…
Makefile	Remove distprep	2 years ago
Makefile.global.in	Don't clean initdb files on template creation failure	2 years ago
Makefile.shlib	Stop using "-multiply_defined suppress" on macOS.	2 years ago
meson.build	…
nls-global.mk	Remove distprep	2 years ago