MFC r321816:
Avoid reading a snapshot block when it is already in the cache.

MFC r321349:
Improve publication of the newly allocated snapdata.

MFC r321348:
Unlock correct lock in ffs_snapblkfree().

MFC r321347:
Account for lock recursion when transfering snaplock to the vnode lock
in ffs_snapremove().

MFC r297791:
UFS: replace 0 with NULL for pointers.

While here also do late initialization of the variables we are
changing.

Found with devel/coccinelle.

Reviewed by: mckusick

MFC r275897:
Set NOCACHE flag for CREATE namei() calls, do not specially handle
MAKEENTRY in VOP_LOOKUP().

MFC r262678;
ufs: small formatting fixes.

Cleanup some extra space.
Use of tabs vs. spaces.
No functional change.

Reviewed by: mckusick

MFC r275897:
Set NOCACHE flag for CREATE namei() calls, do not specially handle
MAKEENTRY in VOP_LOOKUP().

MFC r262678;
ufs: small formatting fixes.

Cleanup some extra space.
Use of tabs vs. spaces.
No functional change.

Reviewed by: mckusick