NFS: Convert mount option parsing to use functionality from fs_parser.h
Split out from commit "NFS: Add fs_context support." Convert existing mount option definitions to fs_parameter_enum's and fs_parameter_spec's. Parse mount options using fs_parse() and lookup_constant(). Notes: 1) Fixed a typo in the udp6 definition in nfs_xprt_protocol_tokens from the original commit. 2) fs_parse() expects an fs_context as the first arg so that any errors can be logged to the fs_context. We're passing NULL for the fs_context (this will change in commit "NFS: Add fs_context support.") which is okay as it will cause logfc() to do a printk() instead. 3) fs_parse() expects an fs_paramter as the third arg. We're building an fs_parameter manually in nfs_fs_context_parse_option(), which will go away in commit "NFS: Add fs_context support.". Signed-off-by: Scott Mayhew <smayhew@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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