Revise pg_pwrite_zeros() The following changes are made to pg_write_zeros(), the API able to write series of zeros using vectored I/O: - Add of an "offset" parameter, to write the size from this position (the 'p' of "pwrite" seems to mean position, though POSIX does not outline ythat directly), hence the name of the routine is incorrect if it is not able to handle offsets. - Avoid memset() of "zbuffer" on every call. - Avoid initialization of the whole IOV array if not needed. - Group the trailing write() call with the main write() call, simplifying the function logic.
Author: Andres Freund Reviewed-by: Michael Paquier, Bharath Rupireddy Discussion: https://postgr.es/m/20230215005525.mrrlmqrxzjzha...@awork3.anarazel.de Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/ce340e530d1f76367379a8d230ad5f411e5f25d2 Modified Files -------------- src/backend/access/transam/xlog.c | 2 +- src/bin/pg_basebackup/walmethods.c | 2 +- src/common/file_utils.c | 62 +++++++++++++------------------------- src/include/common/file_utils.h | 2 +- 4 files changed, 24 insertions(+), 44 deletions(-)
