Christoph Hellwig b4caecd480
fs: introduce f_op->mmap_capabilities for nommu mmap support ...
Since "BDI: Provide backing device capability information [try #3 ]" the
backing_dev_info structure also provides flags for the kind of mmap
operation available in a nommu environment, which is entirely unrelated
to it's original purpose.
Introduce a new nommu-only file operation to provide this information to
the nommu mmap code instead. Splitting this from the backing_dev_info
structure allows to remove lots of backing_dev_info instance that aren't
otherwise needed, and entirely gets rid of the concept of providing a
backing_dev_info for a character device. It also removes the need for
the mtd_inodefs filesystem.
Signed-off-by: Christoph Hellwig <hch@lst.de >
Reviewed-by: Tejun Heo <tj@kernel.org >
Acked-by: Brian Norris <computersforpeace@gmail.com >
Signed-off-by: Jens Axboe <axboe@fb.com >
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