sys/vfs/autofs: Fix autofs_readdir()

autofs: Minimize non functional diff vs FreeBSD

kernel: Remove <sys/n{amei,lookup}.h> from all files that don't need it.

kernel - Normalize the vx_*() vnode interface

* The vx_*() vnode interface is used for initial allocations, reclaims,
and terminations.

Normalize all use cases to prevent the mixing together of

kernel - Normalize the vx_*() vnode interface

* The vx_*() vnode interface is used for initial allocations, reclaims,
and terminations.

Normalize all use cases to prevent the mixing together of the vx_*()
API and the vn_*() API. For example, vx_lock() should not be paired
with vn_unlock(), and so forth.

* Integrate an update-counter mechanism into the vx_*() API, assert
reasonability.

* Change vfs_cache.c to use an int update counter instead of a long.
The vfs_cache code can't quite use the spin-lock update counter API
yet.

Use proper atomics for load and store.

* Implement VOP_GETATTR_QUICK, meant to be a 'quick' version of
VOP_GETATTR() that only retrieves information related to permissions
and ownership. This will be fast-pathed in a later commit.

* Implement vx_downgrade() to convert an exclusive vx_lock into an
exclusive vn_lock (for vnodes). Adjust all use cases in the
getnewvnode() path.

* Remove unnecessary locks in tmpfs_getattr() and don't use
any in tmpfs_getattr_quick().

* Remove unnecessary locks in hammer2_vop_getattr() and don't use
any in hammer2_vop_getattr_quick()

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sys/vfs/autofs: Minor cleanup to sync with NetBSD

autofs: Change email address (sync with FUSE and others)

sys/vfs/autofs: Drop .vop_getpages/.vop_putpages

Autofs only supports getattr/lookup/mkdir/readdir for
inmemory directory inodes.

sys/vfs/autofs: Rename autofs_readdir_one() -> autofs_write_dirent()

sys/vfs/autofs: Don't calculate dirent reclen twice

when autofs_readdir() may call autofs_dirent_reclen() after
returned from autofs_readdir_one().

sys/vfs/autofs: Make {test,nlookup}_fs_root() return bool

Change return type of DragonFly specific utility functions for
triggering (very different from FreeBSD, NetBSD and OpenBSD).

sys/vfs/autofs: Cleanup

sys/vfs/autofs: Cleanups

sys/vfs/autofs: Change autofs_softc::sc_lock to use mutex(9)

sys/vfs/autofs: Add Copyright

sys/vfs/autofs: #if0 unsupported vfs.autofs.mount_on_stat

Keep the code since this should be implemented.

sys/vfs/autofs: Drop unneeded bzero on node/request ctor

sys/vfs/autofs: Fix a comment

This isn't really a FALLTHROUGH. Not sure why I even originally
added this since this had never existed in FreeBSD too.

sys/vfs/autofs: Cleanups (sync with NetBSD and OpenBSD)

FreeBSD has these in autofs.c, but only vfsops needs init/uninit.

sys/vfs/autofs: Cleanups

Move local varaibles to inner scopes where possible.
The existing local variable declarations are mostly from FreeBSD,
but I've also changed NetBSD autofs the way this commi

sys/vfs/autofs: Cleanups

Move local varaibles to inner scopes where possible.
The existing local variable declarations are mostly from FreeBSD,
but I've also changed NetBSD autofs the way this commit does.

(Don't do this for autofs userspace though. Increasing diff from
FreeBSD for non functional thing like this is much less important,
whereas kernel side is basically a rewrite.)

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sys/vfs/autofs: Remove AUTOFS_ASSERT_*LOCKED()

These macros came from FreeBSD, but more readable without these.

sys/vfs/autofs: Change autofs_mount::am_lock to use mutex(9)

sys/vfs/autofs: Change autofs_node::an_vnode_lock to use mutex(9)

sys/vfs/autofs: Remove #if0'd export related code

Exporting is never going to be implemented.

sys/vfs/autofs: Cleanups

sys/vfs/autofs: Cleanups