[Bug 1686679] Re: [SRU] Ubuntu16.04 : autofs takes extreamly long with large number of direct maps

[Hua Zhang]

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Title:
  [SRU] Ubuntu16.04 : autofs takes extreamly long with large number of
  direct maps

Status in autofs5 package in Ubuntu:
  New

Bug description:
  [Impact]

  autofs service in xenial takes extremely long time since its creating
  the directory hierarchy for all direct mounts maps, thus it will take
  too long to make all the automount shares available when using autofs
  with large direct mappings, customer is complaining about this point.
  So we need to backport the following upstream patch.

  https://git.kernel.org/pub/scm/linux/storage/autofs/autofs.git/commit/?id=67e7d613a4b09eeffc57ab44a7acb52027d897b2

  [Test Case]

   * Create an autofs direct mount map with large direct mappings (eg:
  more than 20k)

   * Start autofs service to see if it will take too much time to
  automount all mappings.

  [Regression Potential]

  With this upstream patch, we can avoid creating path compnents on
  remote file system unless that file system is the root file system. so
  theoretically there is no regression potential.

  [Other Info]
   
  Redhat [1] also already backported the following patch, see: https://bugzilla.redhat.com/show_bug.cgi?id=1440769

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