[Bug 1895399] [NEW] Docfix: add missing virtiofsd cache default 'auto'

[Harry Coin]

Public bug reported:

The usage command line for virtiofsd has:

void fuse_cmdline_help(void)
{
    printf("    -h   --help                print help\n"
...
           "    -o cache=<mode>            cache mode. could be one of \"auto, "
           "always, none\"\n"
           "                               default: auto\n"


But the default: auto info is missing from the man page.  I suggest this patch:

--- docs/tools/virtiofsd.rst    2020-09-10 18:07:45.380430677 -0500
+++ /tmp/virtiofsd.rst  2020-09-12 11:48:10.440815204 -0500
@@ -106,6 +106,7 @@
   forbids the FUSE client from caching to achieve best coherency at the cost of
   performance.  ``auto`` acts similar to NFS with a 1 second metadata cache
   timeout.  ``always`` sets a long cache lifetime at the expense of coherency.
+  The default is ``auto``.
 
 Examples
 --------

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1895399

Title:
  Docfix: add missing virtiofsd cache default 'auto'

Status in QEMU:
  New

Bug description:
  The usage command line for virtiofsd has:

  void fuse_cmdline_help(void)
  {
      printf("    -h   --help                print help\n"
  ...
             "    -o cache=<mode>            cache mode. could be one of 
\"auto, "
             "always, none\"\n"
             "                               default: auto\n"

  
  But the default: auto info is missing from the man page.  I suggest this 
patch:

  --- docs/tools/virtiofsd.rst    2020-09-10 18:07:45.380430677 -0500
  +++ /tmp/virtiofsd.rst  2020-09-12 11:48:10.440815204 -0500
  @@ -106,6 +106,7 @@
     forbids the FUSE client from caching to achieve best coherency at the cost 
of
     performance.  ``auto`` acts similar to NFS with a 1 second metadata cache
     timeout.  ``always`` sets a long cache lifetime at the expense of 
coherency.
  +  The default is ``auto``.
   
   Examples
   --------

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