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Dan Magenheimer
077b1f83a6
This third patch of eight in this cleancache series provides the core code for cleancache that interfaces between the hooks in VFS and individual filesystems and a cleancache backend. It also includes build and config patches. Two new files are added: mm/cleancache.c and include/linux/cleancache.h. Note that CONFIG_CLEANCACHE can default to on; in systems that do not provide a cleancache backend, all hooks devolve to a simple check of a global enable flag, so performance impact should be negligible but can be reduced to zero impact if config'ed off. However for this first commit, it defaults to off. Details and a FAQ can be found in Documentation/vm/cleancache.txt Credits: Cleancache_ops design derived from Jeremy Fitzhardinge design for tmem [v8: [email protected]: fix exportfs call affecting btrfs] [v8: [email protected]: use static inline function, not macro] [v7: [email protected]: cleanup sysfs and remove cleancache prefix] [v6: [email protected]: robustly handle buggy fs encode_fh actor definition] [v5: [email protected]: clean up global usage and static var names] [v5: [email protected]: simplify init hook and any future fs init changes] [v5: [email protected]: cleaner non-global interface for ops registration] [v4: [email protected]: interface must support exportfs FS's] [v4: [email protected]: interface must support 64-bit FS on 32-bit kernel] [v3: [email protected]: use one ops struct to avoid pointer hops] [v3: [email protected]: document and ensure PageLocked reqts are met] [v3: [email protected]: fix success/fail codes, change funcs to void] [v2: [email protected]: use sane types] Signed-off-by: Dan Magenheimer <[email protected]> Reviewed-by: Jeremy Fitzhardinge <[email protected]> Reviewed-by: Konrad Rzeszutek Wilk <[email protected]> Acked-by: Al Viro <[email protected]> Acked-by: Andrew Morton <[email protected]> Acked-by: Nitin Gupta <[email protected]> Acked-by: Minchan Kim <[email protected]> Acked-by: Andreas Dilger <[email protected]> Acked-by: Jan Beulich <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Nick Piggin <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Rik Van Riel <[email protected]> Cc: Chris Mason <[email protected]> Cc: Ted Ts'o <[email protected]> Cc: Mark Fasheh <[email protected]> Cc: Joel Becker <[email protected]>