[Devel] [PATCH VZ10 v9 0/8] Add per-VE failcount support

[Vladimir Riabchun]

This patchset introduces per-VE failcount support.
We have several resources, that have per-VE limits,
the users might want to know what limit hits make
operations fail.

- Patch 1 is cosmetic, nothing special.
- Patches 2-4 change mount number and limit processing,
  unifying it with other resources. VE selftest is updated
  in patch 3.
- Patch 5 greatly reduces the amount of copy-pasted code
  by introducing some useful macros.
- Patch 6 adds per-VE failcount file.
- Patch 7 fixes kernel log leak to containers from interrupts.
- Patch 8 introduces new VE selftest, that checks mounts
  accounting, limits and failcount updates.

NOTE: for running new selftest this change should be applied on
top of "[PATCH VZ10 v2 0/3] Improvements for ve selftests" patchset.

https://virtuozzo.atlassian.net/browse/VSTOR-135520

Changes since v8:
 - Added new patch 7 to fix logs leakage from interrupts.
   We are fine if we miss some failure logs in container
   dmesg - CT can check failcounts anyway, and bringing
   new ratelimited printks with specified VE is too hard
   for such a small thing.
 - Selftest in patch 8 got major rework:
   1. Correct mmap error handling.
   2. Dropped mnt_cost value. Let's force 1, it is expected
      value in fresh mount+VE namespaces.
   3. Proper solution for pending mount destructions. It used
      to be just sleep(1) which may not be enoght on loaded
      machines. Instead, issue rcu_barrier and wait on mnt_avail_nr.
      Since we forced mnt_cost == 1, it know precisely what the
      new value should be.

Vladimir Riabchun (8):
  ve/ve.{h,c}: Farewell to spaces as indents
  ve/fs: Rework per-ve mount count
  selftests/ve: Update ve_ns_owner_test
  ve: Move from global VE mounts limit to per-VE limit
  ve/ve.c: Generate VE resource accessors using macros
  ve: Introduce per-VE failcount
  ve/printk: Don't use ve log outside task context
  selftests/ve: Add mount accounting selftest

 fs/aio.c                                      |   1 +
 fs/namespace.c                                |  80 ++-
 include/linux/ve.h                            |  35 +-
 kernel/bpf/syscall.c                          |   1 +
 kernel/printk/printk.c                        |   7 +-
 kernel/ve/ve.c                                | 277 ++++-----
 kernel/ve/veowner.c                           |  19 -
 net/core/dev.c                                |  10 +-
 net/core/neighbour.c                          |   3 +-
 net/core/net_namespace.c                      |   4 +-
 tools/testing/selftests/ve/.gitignore         |   1 +
 tools/testing/selftests/ve/Makefile           |   1 +
 .../selftests/ve/ve_mount_accounting_test.c   | 550 ++++++++++++++++++
 tools/testing/selftests/ve/ve_ns_owner_test.c |  37 +-
 tools/testing/selftests/ve/ve_selftest.h      |  21 +
 15 files changed, 822 insertions(+), 225 deletions(-)
 create mode 100644 tools/testing/selftests/ve/ve_mount_accounting_test.c

-- 
2.47.1