NFS remove vfs_statfs and vnode_mount macro

[shivank]

Summary

delete vfs_statfs macro and inline it at the call sites(only 2).
This macro causes trouble with vfs_statfs field in vfsops structure. Also, the macro definition & purpose contradicts the VFS_STATFS(9)

These macro definitions are no longer needed as NFS OSX port is long dead and they cause conflict in other places.

[asomers]

This change LGTM. But I'll give @rmacklem some time to weigh in before I merge it.

[rmacklem]

Looks fine to me as well. I had never noticed it ended up in multiple
.h files.
I would suggest getting rid of vnode_mount() as well.
And if you feel like doing a lot of editing, "vnode_t" is
really just "struct vnode *" and getting rid of it would
probably make the code more readable (and maintainable?).

I've clicked reviewed, in case you want to leave vnode_mount() for now.

sys/fs/nfs/nfs_commonsubs.c

1406

You could take this a step further and replace
vnode_mount(vp) with vp->v_mount. For example, "vfs_statfs(vnode_mount(vp))->"
can be replaced with "vp->v_mount->mnt_stat.".

Both vfs_statfs() and vnode_mount() were Mac OS/X's way of doing things via
accessor functions and the macros in nfskpiport.h were meant to make the
Mac OS/X code work in FreeBSD.

Since the Mac OS/X port is ancient history, I have planned on eventually
getting rid of all of the macros in nfskpiport.h by doing the replacement
manually. Someday I'll do this for "vnode_t", but it is painful, because after
you do a global substitution, there are a lot of wrapped lines that need to be
fixed, etc. (I did do some of them recently, but haven't gotten around to the rest.

sys/fs/nfs/nfsdport.h

103–104

As noted above, you can get rid of vnode_mount() as well, although
it probably shows up in a lot of places.

[shivank]

Please re-review it,
I updated the diff after removing the vnode_mount macro as suggested by Rick.

sys/fs/nfs/nfsdport.h

103–104

Thanks for the suggestion. I removed vnode_mount(vp) macro and replaced it with the inline code

[rmacklem]

Except for the two inline comments, everything looks fine.

sys/fs/nfs/nfs_commonsubs.c

1405

It might read better as

vp->v_mount->mnt_stat.f_fsid.val[0] ||

instead of taking the address of and then
using it as a pointer.
(Same below.)

sys/fs/nfsclient/nfs_clstate.c

3064

Minor style nit.
BSD likes a 4 space indentation when a statement continues
on a subsequent line.