linux(4): Add a write syscall wrapper

Adding a write syscall wrapper is needed due to Linux family of write
syscalls doesn't distinguish between in kernel blocking operations
and always returns EAGA

linux(4): Add a write syscall wrapper

Adding a write syscall wrapper is needed due to Linux family of write
syscalls doesn't distinguish between in kernel blocking operations
and always returns EAGAIN while FreeBSD can return ENOBUFS.

MFC after: 1 month

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sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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linux(4): Implement close_range over native

Handling of the CLOSE_RANGE_UNSHARE flag is not implemented due to
difference in fd unsharing mechanism in the Linux and FreeBSD.

Reviewed by: mjg
Diffe

linux(4): Implement close_range over native

Handling of the CLOSE_RANGE_UNSHARE flag is not implemented due to
difference in fd unsharing mechanism in the Linux and FreeBSD.

Reviewed by: mjg
Differential revision: https://reviews.freebsd.org/D39398
MFC after: 2 weeks

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linux(4): Add AT_NO_AUTOMOUNT to statx.

Specific to Linux AT_NO_AUTOMOUNT flag tells the kernel to not automount the
terminal component of pathname if it is a directory that is an automount point.
A

linux(4): Add AT_NO_AUTOMOUNT to statx.

Specific to Linux AT_NO_AUTOMOUNT flag tells the kernel to not automount the
terminal component of pathname if it is a directory that is an automount point.
As it is the default for FreeBSD silencly ignore this flag.

glibc-2.34 uses this flag in the stat64 system calls which is used by i386.

Reviewed by: trasz
Differential revision: https://reviews.freebsd.org/D31524
MFC after: 2 weeks

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linux(4): Plug in aarch64 fcntl flags.

Fixes opendir() libc function.

Differential Revision: https://reviews.freebsd.org/D31357
MFC after: 2 weeks

linux: implement O_PATH

Reviewed By: kib
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D29773

linux: extend the LINUX_O_ constants to make room for O_PATH

No functional changes.

Sponsored By: EPSRC

linux(4): Implement name_to_handle_at(), open_by_handle_at()

They are similar to our getfhat(2) and fhopen(2) syscalls.

Differential Revision: https://reviews.freebsd.org/D27111

linuxolator: implement memfd_create syscall

This effectively mirrors our libc implementation, but with minor fudging --
name needs to be copied in from userspace, so we just copy it straight into
st

linuxolator: implement memfd_create syscall

This effectively mirrors our libc implementation, but with minor fudging --
name needs to be copied in from userspace, so we just copy it straight into
stack-allocated memfd_name into the correct position rather than allocating
memory that needs to be cleaned up.

The sealing-related fcntl(2) commands, F_GET_SEALS and F_ADD_SEALS, have
also been implemented now that we support them.

Note that this implementation is still not quite at feature parity w.r.t.
the actual Linux version; some caveats, from my foggy memory:

- Need to implement SHM_GROW_ON_WRITE, default for memfd (in progress)
- LTP wants the memfd name exposed to fdescfs
- Linux allows open() of an fdescfs fd with O_TRUNC to truncate after dup.
(?)

Interested parties can install and run LTP from ports (devel/linux-ltp) to
confirm any fixes.

PR: 240874
Reviewed by: kib, trasz
Differential Revision: https://reviews.freebsd.org/D21845

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Replace LINUX_FASYNC with LINUX_O_ASYNC; no functional changes.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D25218

Properly translate MNT_FORCE flag to Linux umount2(2). Previously
it worked by accident.

MFC after: 2 weeks
Sponsored by: DARPA

Add sync_file_range(2) implementation to linux(4); it's a thin wrapper
over the usual fsync(2).

This silences some warnings when running "apt-get upgrade".

Reviewed by: brooks, emaste
MFC after: 2

Add sync_file_range(2) implementation to linux(4); it's a thin wrapper
over the usual fsync(2).

This silences some warnings when running "apt-get upgrade".

Reviewed by: brooks, emaste
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D22371

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linux_renameat2: improve flag checks

In the cases where Linux returns an error (e.g. passing in an undefined
flag) there's no need for us to emit a message. (The target of this
message is a develop

linux_renameat2: improve flag checks

In the cases where Linux returns an error (e.g. passing in an undefined
flag) there's no need for us to emit a message. (The target of this
message is a developer working on the linuxulatorm, not the author of
presumably broken Linux software).

Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D21606

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Linuxolator whitespace cleanup

A version of each of the MD files by necessity exists for each CPU
architecture supported by the Linuxolator. Clean these up so that new
architectures do not inherit

Linuxolator whitespace cleanup

A version of each of the MD files by necessity exists for each CPU
architecture supported by the Linuxolator. Clean these up so that new
architectures do not inherit whitespace issues.

Clean up shared Linuxolator files while here.

Sponsored by: Turing Robotic Industries Inc.

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sys/compat: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - er

sys/compat: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

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Add several fcntl flags.

Differential Revision: https://reviews.freebsd.org/D1088
Reviewed by: trasz

To avoid code duplication move open/fcntl definitions to the MI
header file.

Differential Revision: https://reviews.freebsd.org/D1087
Reviewed by: trasz

Reduce duplication between i386/linux/linux.h and amd64/linux32/linux.h
by moving bits that are MI out into headers in compat/linux.

Reviewed by: Chagin Dmitry dmitry | gmail
MFC after: 2 weeks

Make the Linux *at() calls a bit more complete.

Properly support:

- AT_EACCESS for faccessat(),
- AT_SYMLINK_FOLLOW for linkat().

Implement the linux syscalls
openat, mkdirat, mknodat, fchownat, futimesat, fstatat, unlinkat,
renameat, linkat, symlinkat, readlinkat, fchmodat, faccessat.

Submitted by: rdivacky
Sponsored

Implement the linux syscalls
openat, mkdirat, mknodat, fchownat, futimesat, fstatat, unlinkat,
renameat, linkat, symlinkat, readlinkat, fchmodat, faccessat.

Submitted by: rdivacky
Sponsored by: Google Summer of Code 2007
Tested by: pho

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