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Accepted
Peter Souter
Asked: 2015-01-20 02:49:04 +0800 CST

File name too long mount_nfs

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I have a FreeBSD Vagrant box that looks like this:

# -*- mode: ruby -*-
# vi: set ft=ruby :

VAGRANTFILE_API_VERSION = "2"

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|

  config.vm.box = "chef/freebsd-10.0"

  config.vm.network "private_network", ip: "10.0.1.10"
  config.vm.synced_folder '.', '/vagrant', :nfs => true, id: "vagrant-root"

end

However, if it tries to run in a directory path with too long a name it fails:

==> default: Mounting NFS shared folders...
The following SSH command responded with a non-zero exit status.
Vagrant assumes that this means the command failed!

mount -t nfs '10.0.1.1:/Users/petersouter/projects/reallylongpathnameover88characterssothatmountfswillfail12345678910111213141516' '/vagrant'

Stdout from the command:



Stderr from the command:

mount_nfs: 10.0.1.1:/Users/petersouter/projects/reallylongpathnameover88characterssothatmountfswillfail12345678910111213141516: File name too long

Is there a way to resolve this other than copying the directory to one with a shorter name? Can I update FreeBSD stuff so it can accept larger file names?

freebsd

1 Answers

  1. Best Answer

    FreeBSD limits the length of mount point names to 88 chars. The reasons for this are somewhat esoteric, but has to do with aligning a memory structure on page boundaries[1].

    You can patch the mount binary to use a larger limit or to remove it all together[2] but this may cause crashes. I have successfully removed the check (also for vagrant with nfs) and had it work without problems, but do so at your own risk. I did not do a full buildworld but rebuilt only the mount_nfs binary with the patch from the second link.

    As a final note, I eventually decided that vagrant with nfs is too buggy and switched to using rsync shared folders instead.

    [1] http://www.secnetix.de/olli/FreeBSD/mnamelen.hawk

    [2] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=167105

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