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* [PATCH v3 0/2] fs, close_range: add flag CLOSE_RANGE_CLOEXEC
@ 2020-11-18 10:47 Giuseppe Scrivano
  2020-11-18 10:47 ` [PATCH v3 1/2] " Giuseppe Scrivano
                   ` (2 more replies)
  0 siblings, 3 replies; 5+ messages in thread
From: Giuseppe Scrivano @ 2020-11-18 10:47 UTC (permalink / raw)
  To: linux-kernel, christian.brauner; +Cc: linux, viro, linux-fsdevel, containers

When the new flag is used, close_range will set the close-on-exec bit
for the file descriptors instead of close()-ing them.

It is useful for e.g. container runtimes that want to minimize the
number of syscalls used after a seccomp profile is installed but want
to keep some fds open until the container process is executed.

v3:
- fixed indentation
- selftests: use ASSERT_EQ instead of EXPECT_EQ for hard failures

v2: https://lkml.kernel.org/lkml/20201019102654.16642-1-gscrivan@redhat.com/
- move close_range(..., CLOSE_RANGE_CLOEXEC) implementation to a separate function.
- use bitmap_set() to set the close-on-exec bits in the bitmap.
- add test with rlimit(RLIMIT_NOFILE) in place.
- use "cur_max" that is already used by close_range(..., 0).

v1: https://lkml.kernel.org/lkml/20201013140609.2269319-1-gscrivan@redhat.com/

Giuseppe Scrivano (2):
  fs, close_range: add flag CLOSE_RANGE_CLOEXEC
  selftests: core: add tests for CLOSE_RANGE_CLOEXEC

 fs/file.c                                     | 44 ++++++++---
 include/uapi/linux/close_range.h              |  3 +
 .../testing/selftests/core/close_range_test.c | 74 +++++++++++++++++++
 3 files changed, 111 insertions(+), 10 deletions(-)

--
2.28.0


^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2020-12-04 11:33 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-11-18 10:47 [PATCH v3 0/2] fs, close_range: add flag CLOSE_RANGE_CLOEXEC Giuseppe Scrivano
2020-11-18 10:47 ` [PATCH v3 1/2] " Giuseppe Scrivano
2020-11-18 10:47 ` [PATCH v3 2/2] selftests: core: add tests for CLOSE_RANGE_CLOEXEC Giuseppe Scrivano
2020-11-22 13:42   ` [selftests] 4d9c16a494: kernel-selftests.core.make_fail kernel test robot
2020-12-04 11:32 ` [PATCH v3 0/2] fs, close_range: add flag CLOSE_RANGE_CLOEXEC Christian Brauner

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