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This is a regression test for a bug in 2.4 kernels. The test must be run
as root on a machine that has a loopback mounted NFS export. The mount
must have root squashing enabled. The test must be run in the root of
the nfs mount, and requires the following environment variable:
EXPORT_PATH => the path that is mounted at the working directory.
Create a test directory and file.
$ umask 022
$ mkdir %{EXPORT_PATH}/test
$ echo blah > %{EXPORT_PATH}/test/blah
Make sure the file can be accessed before.
$ su bin
$ cat test/blah
> blah
Set up a situation that triggers the bug.
$ su
$ chmod go-rwx %{EXPORT_PATH}/test
$ setfacl -m u:bin:rx %{EXPORT_PATH}/test
$ ls -dl %{EXPORT_PATH}/test | awk '{print $1, $3, $4}'
> drwxr-x---+ root root
$ getfacl --omit-header %{EXPORT_PATH}/test 2> /dev/null
> user::rwx
> user:bin:r-x
> group::---
> mask::r-x
> other::---
>
This should also succeed. With the bug, reading the file would
fail with "Stale NFS file handle" or "Input/output error".
$ su bin
$ cat test/blah
> blah
$ sleep 3
$ cat test/blah
> blah
$ cat test/blah
> blah
Clean up.
$ su
$ rm -rf %{EXPORT_PATH}/test
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