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

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Hua Zhang (zhhuabj):

[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

** Affects: autofs5 (Ubuntu)
     Importance: Undecided
         Status: New

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[SRU] Ubuntu16.04 : autofs takes extreamly long with large number of direct maps
https://bugs.launchpad.net/bugs/1686679
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