[Bug 237181] [FUSEFS] support UTIME_NOW in utimensat

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237181

            Bug ID: 237181
           Summary: [FUSEFS] support UTIME_NOW in utimensat
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org

UTIME_NOW is a flag value used by utimensat(2) that means "set the mtime and/or
atime to the current time".  In the FUSE protocol, this intention is indicated
by the FATTR_ATIME_NOW and FATTR_MTIME_NOW bits of the fuse_setattr_in.valid
field during the FUSE_SETATTR command.  We need to support this in our fuse
driver.  

Currently, if you try to use UTIME_NOW on a FUSE file, I think I think "now"
will be resolved in the kernel, which is ok.  However, setting an explicit
timestamp requires VADMIN privileges, whereas setting the time to "now" merely
requires VWRITE.  That means a user without VADMIN privileges can't use
UTIME_NOW until we implement this feature.

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