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    mm/fs: add hooks to support cleancache · c515e1fd
    Dan Magenheimer 提交于
    This fourth patch of eight in this cleancache series provides the
    core hooks in VFS for: initializing cleancache per filesystem;
    capturing clean pages reclaimed by page cache; attempting to get
    pages from cleancache before filesystem read; and ensuring coherency
    between pagecache, disk, and cleancache.  Note that the placement
    of these hooks was stable from 2.6.18 to 2.6.38; a minor semantic
    change was required due to a patchset in 2.6.39.
    
    All hooks become no-ops if CONFIG_CLEANCACHE is unset, or become
    a check of a boolean global if CONFIG_CLEANCACHE is set but no
    cleancache "backend" has claimed cleancache_ops.
    
    Details and a FAQ can be found in Documentation/vm/cleancache.txt
    
    [v8: minchan.kim@gmail.com: adapt to new remove_from_page_cache function]
    Signed-off-by: NChris Mason <chris.mason@oracle.com>
    Signed-off-by: NDan Magenheimer <dan.magenheimer@oracle.com>
    Reviewed-by: NJeremy Fitzhardinge <jeremy@goop.org>
    Reviewed-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Al Viro <viro@ZenIV.linux.org.uk>
    Cc: Matthew Wilcox <matthew@wil.cx>
    Cc: Nick Piggin <npiggin@kernel.dk>
    Cc: Mel Gorman <mel@csn.ul.ie>
    Cc: Rik Van Riel <riel@redhat.com>
    Cc: Jan Beulich <JBeulich@novell.com>
    Cc: Andreas Dilger <adilger@sun.com>
    Cc: Ted Ts'o <tytso@mit.edu>
    Cc: Mark Fasheh <mfasheh@suse.com>
    Cc: Joel Becker <joel.becker@oracle.com>
    Cc: Nitin Gupta <ngupta@vflare.org>
    c515e1fd
mpage.c 20.0 KB