Add the FUSE_BACKING_MAP_CYCLIC flag for FUSE_NOTIFY_BACKING_MAP notifications to enable creating striped maps. This is just a set of regular extents that repeats after the end of the last extent using a striping pattern (i.e. on the target backings the stripes have a contiguous footprint). Two additional limits apply compared to non-cyclic extent map population: - the size of the extents (chunk size) must be equal - the extents must start from zero offset and follow each other without gaps. Originally-by: John Groves <john@groves.net> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>