Hey,
This is v3 of this patchset.
This fixes a braino spotted by Oleg (/me tips proverbial hat) and splits
the implementation of close_range() into adding the actual syscall and
the wiring-up of the syscall itself as requested by Arnd. It also adds a
missing bump of __NR_compat_syscalls for arm64 that Arnd spotted.
For controversy around whether or not this is the greatest idea and api
ever I refer the avid reader to the comment section of LWN.
/* v2 */
In accordance with some comments by Linus and Al there's a
cond_resched() added to the close loop similar to what is done for
close_files().
A common helper pick_file() for __close_fd() and __close_range() has
been split out. This allows to only make a cond_resched() call when
filp_close() has been called similar to what is done in close_files().
Maybe that's not worth it. Jann mentioned that cond_resched() looks
rather cheap.
So it maybe that we could simply do:
while (fd <= max_fd) {
__close_fd(files, fd++);
cond_resched();
}
I also added a missing test for close_range(fd, fd, 0).
Thanks!
Christian
Christian Brauner (3):
open: add close_range()
arch: wire-up close_range()
tests: add close_range() tests
arch/alpha/kernel/syscalls/syscall.tbl | 1 +
arch/arm/tools/syscall.tbl | 1 +
arch/arm64/include/asm/unistd.h | 2 +-
arch/arm64/include/asm/unistd32.h | 2 +
arch/ia64/kernel/syscalls/syscall.tbl | 1 +
arch/m68k/kernel/syscalls/syscall.tbl | 1 +
arch/microblaze/kernel/syscalls/syscall.tbl | 1 +
arch/mips/kernel/syscalls/syscall_n32.tbl | 1 +
arch/mips/kernel/syscalls/syscall_n64.tbl | 1 +
arch/mips/kernel/syscalls/syscall_o32.tbl | 1 +
arch/parisc/kernel/syscalls/syscall.tbl | 1 +
arch/powerpc/kernel/syscalls/syscall.tbl | 1 +
arch/s390/kernel/syscalls/syscall.tbl | 1 +
arch/sh/kernel/syscalls/syscall.tbl | 1 +
arch/sparc/kernel/syscalls/syscall.tbl | 1 +
arch/x86/entry/syscalls/syscall_32.tbl | 1 +
arch/x86/entry/syscalls/syscall_64.tbl | 1 +
arch/xtensa/kernel/syscalls/syscall.tbl | 1 +
fs/file.c | 62 +++++++-
fs/open.c | 20 +++
include/linux/fdtable.h | 2 +
include/linux/syscalls.h | 2 +
include/uapi/asm-generic/unistd.h | 4 +-
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/core/.gitignore | 1 +
tools/testing/selftests/core/Makefile | 6 +
.../testing/selftests/core/close_range_test.c | 142 ++++++++++++++++++
27 files changed, 250 insertions(+), 10 deletions(-)
create mode 100644 tools/testing/selftests/core/.gitignore
create mode 100644 tools/testing/selftests/core/Makefile
create mode 100644 tools/testing/selftests/core/close_range_test.c
--
2.21.0
