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Restructure uio to accommodate bio_vec
Starting from Linux 4.1, bio_vec will be allowed to pass into filesystem via iter_read/iter_write, so we add a bio_vec field in uio_t to hold it, and use UIO_BVEC in segflg to determine which "vec". Also, to be consistent to newer kernel, we make iovec and bio_vec immutable, and make uio act as an iterator with the new uio_skip field indicating number of bytes to skip in the first segment. Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue openzfs#3511 Issue openzfs#3640 Closes openzfs#468
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