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NFS: nfs_compare_mount_options always compare auth flavors.
[ Upstream commit 594d1644cd
]
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>
This commit is contained in:
parent
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commit
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1 changed files with 1 additions and 2 deletions
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@ -2401,8 +2401,7 @@ static int nfs_compare_mount_options(const struct super_block *s, const struct n
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goto Ebusy;
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if (a->acdirmax != b->acdirmax)
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goto Ebusy;
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if (b->auth_info.flavor_len > 0 &&
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clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
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if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
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goto Ebusy;
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return 1;
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Ebusy:
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