Fixes #127.

This enhances nodes which embed defaultNode (which is most of them),
allowing those implementations to omit a GetAttr() method. Without this,
when the kernel calls GetAttr() for an open file, FUSE will return a
size of zero, causing a read() of the file to always return 0, even
though fuse returns a nonzero number of bytes.

One can leverage this behavior to create a Linux procfs-like file, which
stat shows to be zero bytes, but can be successfully read.

N.B. This behavior is only useful if the FileSystemConnector Options
specify AttrTimeout of zero. Otherwise, the result of the first call to
GetAttr() (file == nil) is cached, and the kernel allows zero bytes to
be read. With this caching disabled, the next GetAttr() call (file !=
nil) will be used to control the number of readable bytes.

1) Fix the "a" instead of "m" typo in loopbackFile.Utimens.
   Besides the incorrect behavoir, this causes a crash if "a"
   is nil.
   Obsoletes https://github.com/hanwen/go-fuse/pull/100 .

2) Enable nanosecond resolution for dates after 1970.
   syscall.NsecToTimespec is broken for dates before 1970 but
   works fine otherwise, so let's keep the nanoseconds there.

3) Deduplicate the time conversion code in nodefs and paths into
   the new function fuse.UtimeToTimespec.

4) Add a test case.

Panic if we insert invalid branchResult into the cache.

Should provide more data for bug #109.

Ensure all.bash tests compilation on both Darwin and Linux.

Fixes #125.

This makes it evident which tests leak mount points.

Move shared test utilities into internal/testutil/ package.

This is less overhead, and fixes the darwin tests that use InitIn.

Fixed handling of ENOSYS in unionfs.

When mounting using relative paths, "touch" on directories
used to fail.

"touch" on files works accidentially because it uses a
file descriptor internally.

  $ loopback b a &
  $ cd b
  $ mkdir foo
  $ touch foo
  touch: setting times of 'foo': Not a directory

strace:

  [pid 30185] utimensat(0, "a/foo", [{1468441847, 0}, {1468441847, 0}], AT_SYMLINK_NOFOLLOW <unfinished ...>
  [pid 30185] <... utimensat resumed> )   = -1 ENOTDIR (Not a directory)

On Mac OS X the Finder loses its mind if GetXAttr returns ENODATA
rather than ENOATTR. On Linux, ENOATTR is just an alias for ENOATTR.

The Linux man page references ENOATTR:
http://man7.org/linux/man-pages/man2/fgetxattr.2.html

Gerrithub requires overly broad write permissions, and hence its usage
is discontinued.

Add AUTHORS file.

This makes CFuse and go-fuse easier to compare.  Get rid of the
baroque analysis code, unused delay code, and some general cleanup.

Surpress benchmark if -v is not given.

circuit our read.

Change-Id: Id83c4b3738c5cedf9d9b738cab21632db6061126

kernel.

Change-Id: Ic481d3aadac3979722f9d7c1e2f8d305dcbd7e10

Use normal loopback for LargeWrite test, and move it into
loopback_test.go

Change-Id: I61c8186aea63f7bb6e591f1bcadcdad49e0866fe

Change-Id: Id6edd71df1e623affbbc66b2d96b5c23aedd3fe0

Check for kernel version before trying notify.

Change-Id: I6b241dd53377d4aa43b109b981f3941d2ad8dbb4

The strategy was inspired by the mount code for Darwin in
bazil.org/fuse.

Unfortunately, OSX must have the event loop started before mounting
can be completed. This means that WaitMount() must be maintained for
use on OSX.

Change-Id: Ie53425f306b4575b3e94e45407bab05017f5ce14

Change-Id: I6e17cd513f1a26110a36208f36d1a190675eb986

Change-Id: I6a340b15a4876998616c7c16574b38531a9ba9c7

Change-Id: I265108f96471b9b472c29c2d9fbbd1d4dd6b44d0

Change-Id: I8eeddc02b1793fb546aa35f50c99b9e912d19123

Change-Id: Iec448c7b731893312a846f6b42c87c660b2399d6

This ensures that the caller can access fsConnector.Server(), eg. to
inspect the InitRequest or InitResponse.

Change-Id: Ia09d77eae0f1af8bce46b07f386fdda20b2ccb95