[PATCH 0/9] ext4: Bunch of DIO/AIO fixes V2

There are number of races exist caused by lack of synchronization
between DIO workers in flight and truncate/fsync/punch_hole routines
This patch series try to optimize and fix existing DIO/AIO code.

This patch-set survives after all my tests(except fsdefrag)
I observe significant performance improvements for big SMP hosts
performind DIO for single file.

TOC:
# first one is simply a cleanup
ext4: ext4_inode_info diet
# Cleanup and bug fixes
ext4: completed_io locking cleanup V2
ext4: serialize dio nonlocked reads with defrag workers V3
ext4: punch_hole should wait for DIO writers
ext4: serialize unlocked dio reads with truncate
ext4: endless truncate due to nonlocked dio readers V2
ext4: serialize truncate with owerwrite DIO workers V2
# Nasty panch_hole regressions
ext4: fix ext_remove_space for punch_hole case
ext4: fix ext4_ext_remove_space tree traversal

Signed-off-by: Dmitry Monakhov <redacted>

 ext4.h        |   27 +++++++++++++++----
 extents.c     |   82 ++++++++++++++++++++++++++++++++--------------------------
 fsync.c       |   47 +++++++++++----------------------
 indirect.c    |   17 +++++++++---
 inode.c       |   49 ++++++++++++++--------------------
 move_extent.c |    8 +++++
 page-io.c     |   76 ++++++++++++++---------------------------------------
 super.c       |    1
 8 files changed, 148 insertions(+), 159 deletions(-)