Change do_sys_mount() so that it only takes as argument the type of the
drive instead of its associated vfsops. Makes it more friendly, and allows
compat binaries to autoload VFS modules if needed.

sent on tech-kern@, ok christos@

branches: 1.33.2;
Do not uselessly include <sys/malloc.h>.

branches: 1.32.36;
regen:
- remove nfssvc / fs_nfs.h / #ifdef NFS
- make getfh unconditional

branches: 1.31.10; 1.31.12; 1.31.30;
Convert all the system call entry points from:
int foo(struct lwp *l, void *v, register_t *retval)
to:
int foo(struct lwp *l, const struct foo_args *uap, register_t *retval)
Fixup compat code to not write into 'uap' and (in some cases) to actually
pass a correctly formatted 'uap' structure with the right name to the
next routine.
A few 'compat' routines that just call standard ones have been deleted.
All the 'compat' code compiles (along with the kernels required to test
build it).
98% done by automated scripts.

branches: 1.30.4;
ANSIfy most of the function definitions in sys/compat (but not ndis).
All by the magic of sed ...

Remove all the __P

branches: 1.28.6; 1.28.8; 1.28.14; 1.28.16;
use the compat MFSNAMELEN

Remove all the syscall stubs that were only there to get files lookup
up in the alternate path.

Change compat mount code to pass do_sys_mount() kernel resident buffers.
Possibly the standard nfs code needs teaching how to set the length and
address family in order to support non-netbsd sockaddr.
There are now no active stackgap() calls in the compat tree.

Change the way that emulations locate files within the emulation root to
avoid having to allocate space in the 'stackgap'
- which is very LWP unfriendly.
The additional code for non-emulation namei() is trivial, the reduction for
the emulations is massive.
The vnode for a processes emulation root is saved in the cwdi structure
during process exec.
If the emulation root the TRYEMULROOT flag are set, namei() will do an initial
search for absolute pathnames in the emulation root, if that fails it will
retry from the normal root.
".." at the emulation root will always go to the real root, even in the middle
of paths and when expanding symlinks.
Absolute symlinks found using absolute paths in the emulation root will be
relative to the emulation root (so /usr/lib/xxx.so -> /lib/xxx.so links
inside the emulation root don't need changing).
If the root of the emulation would be returned (for an emulation lookup), then
the real root is returned instead (matching the behaviour of emul_lookup,
but being a cheap comparison here) so that programs that scan "../.."
looking for the root dircetory don't loop forever.
The target for symbolic links is no longer mangled (it used to get the
CHECK_ALT_xxx() treatment, so could get /emul/xxx prepended).
CHECK_ALT_xxx() are no more. Most of the change is deleting them, and adding
TRYEMULROOT to the flags to NDINIT().
A lot of the emulation system call stubs could now be deleted.

branches: 1.24.2; 1.24.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.23.2;
Merge newlock2 to head.

branches: 1.22.4;
Make freebsd_sys_getfh use compat_30_sys_getfh

branches: 1.21.4; 1.21.8; 1.21.16;
merge ktrace-lwp.

branches: 1.20.12;
Replace the statfs() family of system calls with statvfs().
Retain binary compatibility.

branches: 1.19.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Merge the nathanw_sa branch.

make the stackgap_{init,alloc} functions MP friendly (i.e. pass struct proc *
in, instead of using curproc). While there add an optional size argument to
stackgap_init.

add RCSIDs (including regeneration of files as appropriate)

branches: 1.14.2;
use _KERNEL_OPT.

branches: 1.13.2;
Use CHECK_ALT_SYMLINK() instead CHECK_ALT_EXISTS() where appropriate.
This addresses kern/11757.

constify

LKMify

add e_path (emulation path) to struct emul, which replaces emulation-specific
*_emul_path variables

change macros CHECK_ALT_{CREAT|EXIST} to use that, 'root' doesn't need
to be passed explicitly any more and *_CHECK_ALT_{CREAT|EXIST} are removed
change explicit emul_find() calls in probe functions to get the emulation
path from the checked exec switch entry's emulation

remove no longer needed header files

add e_flags and e_syscall to struct emul; these are unsed and empty for now

branches: 1.9.14;
Include the NFS option header.

Use stat12; from Enami Tsugutomo

ostat -> stat43

New function freebsd_sys_lchown() to emulate FreeBSD lchown(2).

branches: 1.5.8;
NFSCLIENT -> NFS

branches: 1.4.2;
Define execv() and execve() consistently across emulations.
Do path name translation.

branches: 1.3.4;
gcc -Wall fixes.

ufs ==> ffs

branches: 1.1.2;
FreeBSD binary compatibility module, from Noriyuki Soda.