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    Subject[PATCH] add page->mapping handling interface [0/35] intro
    Hi, this patch set adds following functions

    - page_inode(page) ... returns inode from page, (page->mapping->host)
    - page_mapping_cache(page) ... returns addrees_space from page
    - page_mapping_anon(page) ... return anon_vma from page
    - page_is_pagecache(page) ... returns 1 if the page is page cache
    - pagecache_consistent(page, mapping) ... returns if page_mapping_cache(page)
    equals to mapping.

    By adding aboves, this patch set removes all *direct* references to
    page->mapping in usual codes. (compile tested with all mod config.)

    I think this can improve VM/FS dependency and make things robust.
    In addition, page->mapping is not a just address_space, now.
    (And we can hide page->mapping details from moduled FSs.)

    patch set is structured as
    [1] ... new interface definition
    [2] ... changes in /mm
    [3] ... changes in /kernel and /fs
    [4...] ... changes in each FSs. (most of patches are very small.)

    Any comments are welcome.

    Thanks,
    -Kame

    -
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