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[PATCH v5 0/4] stat: better utilization of statx() on the backend

From: Jeff Layton
Subject: [PATCH v5 0/4] stat: better utilization of statx() on the backend
Date: Mon, 13 May 2019 09:18:27 -0400

v5: style cleanups
    fix warnings from make syntax-check
    switch --cached= option to use XARGMATCH
    fix --cached=default to set force_sync/dont_sync flags to false

v4: switched to single --cached= option instead of separate
    --force-sync and --dont-sync options

v3: fix stat-hyphen and usage_vs_getopt test failures

v2: only do statx->stat conversion once
    fixes for mask creation based on format
    fix birthtime handling
    use already-converted timespecs from struct stat for times

This is the fifth posting of this patchset. This one is mostly syntax
cleanups, but I've also reworked the new option to use XARGMATCH and
fixed a bug when --cached=default is set after other --cached= options.
"make check" and "make syntax-check" now pass.

This patchset changes the /bin/stat program to use the statx() system
call when available instead of stat()/lstat()/fstat(). This allows us to
avoid fetching attributes that we don't intend to display, which can be a
major performance improvement on some filesystems (particularlynetworked
or clustered ones).

This also adds a new command-line option that allows it to control
whether to synchronize with the backend server (again, mostly useful on
network filesystems).

Jeff Layton (4):
  stat: drop statbuf argument from out_epoch_sec()
  stat: use statx instead of stat if it's available
  stat: only set STATX_* mask bits for things we want to print
  stat: support statx DONT_SYNC and FORCE_SYNC flags

 NEWS       |   7 +
 src/stat.c | 808 ++++++++++++++++++++++++++++++++++++++---------------
 2 files changed, 584 insertions(+), 231 deletions(-)


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