faccessat(2): Honor AT_SYMLINK_NOFOLLOW

Make the system call honor `AT_SYMLINK_NOFOLLOW`.

Also enable this from `linux_faccessat2` where the issue arised the first time.
Update manual pages accordi

faccessat(2): Honor AT_SYMLINK_NOFOLLOW

Make the system call honor `AT_SYMLINK_NOFOLLOW`.

Also enable this from `linux_faccessat2` where the issue arised the first time.
Update manual pages accordingly.

PR: 275295
Reported by: [email protected]
Approved by: kib@
Differential Revision: https://reviews.freebsd.org/D46267

(cherry picked from commit 5ab6ed93cd3680f8b69dd4d05823f4740a2bdef9)

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Abstract UIO allocation and deallocation.

Introduce the allocuio() and freeuio() functions to allocate and
deallocate struct uio. This hides the actual allocator interface, so it
is easier to modify

Abstract UIO allocation and deallocation.

Introduce the allocuio() and freeuio() functions to allocate and
deallocate struct uio. This hides the actual allocator interface, so it
is easier to modify the sub-allocation layout of struct uio and the
corresponding iovec array.

Obtained from: CheriBSD
Reviewed by: kib, markj
MFC after: 2 weeks
Sponsored by: CHaOS, EPSRC grant EP/V000292/1
Differential Revision: https://reviews.freebsd.org/D43711

(cherry picked from commit 61cc4830a7b16400efade3d884a59fda6d80d651)

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linux(4): Replace linux32_copyinuio by freebsd32_copyinuio

MFC after: 1 month

linux(4): Return EAGAIN instead of ENOBUFS for non-blocking sockets in pwrite

MFC after: 1 month

linux(4): Return EAGAIN instead of ENOBUFS for non-blocking sockets in pwritev

MFC after: 1 month

linux(4): Add a dedicated writev syscall wrapper

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

linux(4): Add a dedicated writev syscall wrapper

Adding a writev 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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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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linux(4): Remove sys/cdefs.h inclusion where it's not needed due to 685dc743

sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

linux(4): Use M_LINUX for malloc type in getdents

MFC after: 2 weeks

linux(4): Use M_LINUX for malloc type in getdents64

MFC after: 2 weeks

linux(4): Delete a useless variable in getdents64

MFC after: 2 weeks

linux(4): Use M_LINUX for malloc type in readdir

MFC after: 2 weeks

linux(4): Delete a useless variable in readdir

MFC after: 2 weeks

linux(4): Properly allocate buffer for kern_getdirentries in readdir

Looks like prior to ino64 project the size of the struct linux_dirent
was greater (or equal) to the size of the native struct dir

linux(4): Properly allocate buffer for kern_getdirentries in readdir

Looks like prior to ino64 project the size of the struct linux_dirent
was greater (or equal) to the size of the native struct dirent so the
native dirent fit into the buffer. After ino64 project the size of the
native struct dirent has increased.

Spotted by gcc12.
MFC after: 2 weeks

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linux(4): Use pwd_altroot() to tell namei() about ABI root path

PR: 72920
Differential Revision: https://reviews.freebsd.org/D40090
MFC after: 2 month

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): Add a dedicated statat() implementation

Get rid of calling Linux stat translation hook and specific to Linux
handling of non-vnode dirfd from kern_statat(),

Reviewed by: kib, mjg
Differe

linux(4): Add a dedicated statat() implementation

Get rid of calling Linux stat translation hook and specific to Linux
handling of non-vnode dirfd from kern_statat(),

Reviewed by: kib, mjg
Differential revision: https://reviews.freebsd.org/D35474

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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): Cleanup includes under compat/linux

Cleanup unneeded includes, sort the rest according to style(9).
No functional changes.

MFC after: 2 weeks

linux(4): Get rid of the opt_compat.h include.

Since e013e369 COMPAT_LINUX, COMPAT_LINUX32 build options are removed,
so include of opt_compat.h is no more needed.

MFC after: 2 weeks

linux(4): Fix unlinkat() after a125ed50

MFC after: 2 weeks

linux(4): Fix unlink() after a125ed50

MFC after: 2 weeks

linux(4): Fixed offset miscalculation in the preadv/pwritev syscalls.

MFC after: 2 weeks

linux(4): readlink should fail if bufzis <= 0.

MFC after: 2 weeks