xfs: allow ro mounts if rtdev or logdev are read-only
Allow read-only mounts on rtdevs and logdevs that are marked as read-only and make sure those mounts can't be remounted read-write. Use the sb_open_mode helper to make sure that we don't try to open devices with write access enabled for read-only mounts. Signed-off-by:Hans Holmberg <hans.holmberg@wdc.com> Reviewed-by:
Christoph Hellwig <hch@lst.de> Reviewed-by:
Carlos Maiolino <cmaiolino@redhat.com> Signed-off-by:
Carlos Maiolino <cem@kernel.org>
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