Chris Perl d9783bcebb NFS: nfs_compare_mount_options always compare auth flavors.
[ Upstream commit 594d1644cd59447f4fceb592448d5cd09eb09b5e ]

This patch removes the check from nfs_compare_mount_options to see if a
`sec' option was passed for the current mount before comparing auth
flavors and instead just always compares auth flavors.

Consider the following scenario:

You have a server with the address 192.168.1.1 and two exports /export/a
and /export/b.  The first export supports `sys' and `krb5' security, the
second just `sys'.

Assume you start with no mounts from the server.

The following results in EIOs being returned as the kernel nfs client
incorrectly thinks it can share the underlying `struct nfs_server's:

$ mkdir /tmp/{a,b}
$ sudo mount -t nfs -o vers=3,sec=krb5 192.168.1.1:/export/a /tmp/a
$ sudo mount -t nfs -o vers=3          192.168.1.1:/export/b /tmp/b
$ df >/dev/null
df: ‘/tmp/b’: Input/output error

Signed-off-by: Chris Perl <cperl@janestreet.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-02-12 19:46:07 +01:00
..
2018-07-08 15:30:51 +02:00
2018-07-17 11:39:26 +02:00
2018-12-05 19:41:25 +01:00
2018-12-17 09:28:54 +01:00
2019-02-12 19:46:03 +01:00
2018-12-21 14:13:04 +01:00
2017-09-04 19:05:15 -04:00
2018-05-16 10:10:25 +02:00