[PATCH] tmpfs: support loopback
Patch from Hugh Dickins Added shmem_readpage and shmem_prepare_write so tmpfs files can be used by the loop driver (together with simple_commit_write). shmem_getpage extended to accept file page passed in, which may have to be copied over from swap page. Use bdget and sb_set_blocksize so loop can see our preferred blocksize PAGE_CACHE_SIZE. Use copy_highpage, removed from highmem.h in 2.4.17: restore it but with kmap_atomics. Restore (a simple) copy_page to asm-sparc64/page.h, which alone of all arches discarded it.
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