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[ Upstream commit3524b021b0] The extent returned by the file system may have a smaller offset than the segment offset requested by the client. In this case, the minimum segment length must be checked against the requested range. Otherwise, the client may not be able to continue the read/write operation. Fixes:8650b8a058("nfsd: pNFS block layout driver") Signed-off-by: Sergey Bashirov <sergeybashirov@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org>