MFC r300411:

Minor style(9) cleanup, no functional changes.

MFC r298482:
Cleanup redundant parenthesis from existing howmany()/roundup() macro uses.

Requested by: dchagin

MFC r283465:

Add preliminary fallocate system call implementation
to emulate posix_fallocate() function.

MFC r283439:

Implement F_DUPFD_CLOEXEC fcntl flag.

MFC r283428:

Change linux faccessat syscall definition to match actual linux one.

The AT_EACCESS and AT_SYMLINK_NOFOLLOW flags are actually implemented
within the glibc wrapper function for faccessat(). If either of these
flags are specified, then the wrapper function employs fstatat() to
determine access permissions.

MFC r283427:

Where possible we will use M_LINUX malloc(9) type.
Move M_FUTEX defines to the linux_common.ko.

MFC r283415:

Disable i386 call for x86-64 Linux.

MFC r283399:

Implement dup3() system call.

MFC r281726:

Optimize the O_NOCTTY handling hack in linux_common_open().

MFC r281728:

Add back fdrop() missed in r281726.

Sponsored by: The FreeBSD Foundation

MFC r281689:

Remove unused code from linux_mount(), and make it possible to mount
any kind of filesystem instead of harcoded three.

Sponsored by: The FreeBSD Foundation

Merge r263233 from HEAD to stable/10:

Update kernel inclusions of capability.h to use capsicum.h instead; some
further refinement is required as some device drivers intended to be
portable over FreeBSD versions rely on __FreeBSD_version to decide whether
to include capability.h.

Sponsored by: Google, Inc.

Merge r263233 from HEAD to stable/10:

Update kernel inclusions of capability.h to use capsicum.h instead; some
further refinement is required as some device drivers intended to be
portable over FreeBSD versions rely on __FreeBSD_version to decide whether
to include capability.h.

Sponsored by: Google, Inc.